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A member asked:
Treated canker sore with hydrogen peroxide and it got twice as big and painful. i've had the sore for 3 days now. what can i do?
A doctor has provided 1 answer
Canker sores: is the most common oral lesions. Most ulcers, infections will clear up by themselves within a week or two. You should see your GP or dentist if the ulcer gets worse or lasts for longer than 2 weeks. Best of luck.
Answered 2/27/2017
2.8k views
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